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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 639 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.9 × 5 = ?5 — what is the missing digit?
  2. 2.1 + 2 + 3 + … + 100 =
  3. 3.9 × 10 = 9? — what is the missing digit?
  4. 4.1 + 3 + 5 + … + 49 =
  5. 5.The 4th of a month is a Thursday. What day is the 17th of the same month? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  6. 6.9 × 8 = 7? — what is the missing digit?
  7. 7.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
  8. 8.If today is Thursday, what day was it 36 days ago? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  9. 9.The ages of two twins add up to 8. How old is each twin?
  10. 10.Odd one out: which number is NOT in the 9 times table? (a) 18 (b) 54 (c) 45 (d) 29
  11. 11.What comes next? 13, 19, 25, 31, ? (a) 38 (b) 37 (c) 31 (d) 43
  12. 12.44 × 4 =
  13. 13.111111 × 111111 =
  14. 14.Magic trick! Think of 4. Double it, add 12, halve it, then take away 4. What number do you get?
  15. 15.109 × ? = 1090
  16. 16.In 3 years a boy will be 17 years old. How old was he 3 years ago?
  17. 17.9 × 3 =
  18. 18.What comes next? 12, 15, 18, 21, ? (a) 24 (b) 25 (c) 21 (d) 27
  19. 19.If today is Friday, what day was it 52 days ago? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  20. 20.A father is 40 years old and his son is 9. How old was the father when the son was born?
  21. 21.Magic square (every row, column and diagonal has the same total): 9 10 5 | 4 8 12 | ? 6 7. What is the missing number?
  22. 22.If today is Tuesday, what day was it 25 days ago? (a) Monday (b) Friday (c) Saturday (d) Thursday
  23. 23.Magic square (every row, column and diagonal has the same total): 5 10 3 | 4 6 8 | 9 2 ?. What is the missing number?
  24. 24.44 × ? = 440
  25. 25.A father is 38 years old and his son is 12. How old was the father when the son was born?
  26. 26.1 + 2 + 3 + … + 60 =
  27. 27.Odd one out: which number is NOT in the 5 times table? (a) 10 (b) 48 (c) 30 (d) 15
  28. 28.198 + 891 =
  29. 29.37 × 27 =
  30. 30.9 × 9 =
  31. 31.Think of 9. Multiply it by 2, then add 5. What number do you end with?
  32. 32.2 × 9 =
  33. 33.Double 93 =
  34. 34.9 × 7 = 6? — what is the missing digit?
  35. 35.37 × 21 =
  36. 36.693 + 396 =
  37. 37.?622 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.14 × 4 =
  39. 39.The 5th of a month is a Friday. What day is the 17th of the same month? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
  40. 40.A piggy bank has 10 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?

Answer key

  1. 4
  2. 5050
  3. 0
  4. 625
  5. Wednesday
  6. 2
  7. 10
  8. Wednesday
  9. 4
  10. 29
  11. 37
  12. 176
  13. 12345654321
  14. 6
  15. 10
  16. 11
  17. 27
  18. 24
  19. Tuesday
  20. 31
  21. 11
  22. Friday
  23. 7
  24. 10
  25. 26
  26. 1830
  27. 48
  28. 1089
  29. 999
  30. 81
  31. 23
  32. 18
  33. 186
  34. 3
  35. 777
  36. 1089
  37. 8
  38. 56
  39. Wednesday
  40. 72

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